Fox News has learned from sources who were on the ground in Benghazi that an urgent request from the CIA annex for military back-up during the attack on the U.S. consulate and subsequent attack several hours later on the annex itself was denied by the CIA chain of command — who also told the CIA operators twice to “stand down” rather than help the ambassador’s team when shots were heard at approximately 9:40 p.m. in Benghazi on Sept. 11.